Gal 4.23 But he who was of the bondwoman was born after the flesh; but he of the freewoman was by promise.
Gen 21.12 And God said unto Abraham, Let it not be grievous in thy sight because of the lad, and because of thy bondwoman; in all that Sarah hath said unto thee, hearken unto her voice; for in Isaac shall thy seed be called.
Evr 11.18 Of whom it was said, That in Isaac shall thy seed be called: